Source code for tests.system.providers.amazon.aws.example_rds_event

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from datetime import datetime

import boto3

from airflow import DAG
from airflow.decorators import task
from airflow.models.baseoperator import chain
from airflow.providers.amazon.aws.hooks.rds import RdsHook
from airflow.providers.amazon.aws.operators.rds import (
    RdsCreateEventSubscriptionOperator,
    RdsDeleteEventSubscriptionOperator,
)
from airflow.utils.trigger_rule import TriggerRule
from tests.system.providers.amazon.aws.utils import ENV_ID_KEY, SystemTestContextBuilder

[docs]DAG_ID = 'example_rds_event'

[docs]sys_test_context_task = SystemTestContextBuilder().build()


@task
[docs]def create_sns_topic(env_id) -> str:
    return boto3.client('sns').create_topic(Name=f'{env_id}-topic')['TopicArn']


@task
[docs]def create_rds_instance(db_name, instance_name) -> None:
    rds_client = RdsHook().get_conn()
    rds_client.create_db_instance(
        DBName=db_name,
        DBInstanceIdentifier=instance_name,
        AllocatedStorage=20,
        DBInstanceClass='db.t3.micro',
        Engine='postgres',
        MasterUsername='username',
        # NEVER store your production password in plaintext in a DAG like this.
        # Use Airflow Secrets or a secret manager for this in production.
        MasterUserPassword='rds_password',
    )

    rds_client.get_waiter('db_instance_available').wait(DBInstanceIdentifier=instance_name)


@task(trigger_rule=TriggerRule.ALL_DONE)
[docs]def delete_db_instance(instance_name) -> None:
    rds_client = RdsHook().get_conn()
    rds_client.delete_db_instance(
        DBInstanceIdentifier=instance_name,
        SkipFinalSnapshot=True,
    )

    rds_client.get_waiter('db_instance_deleted').wait(DBInstanceIdentifier=instance_name)


@task(trigger_rule=TriggerRule.ALL_DONE)
[docs]def delete_sns_topic(topic_arn) -> None:
    boto3.client('sns').delete_topic(TopicArn=topic_arn)


with DAG(
    dag_id=DAG_ID,
    schedule_interval='@once',
    start_date=datetime(2021, 1, 1),
    tags=['example'],
    catchup=False,
) as dag:
[docs]    test_context = sys_test_context_task()

    rds_db_name = f'{test_context[ENV_ID_KEY]}_db'
    rds_instance_name = f'{test_context[ENV_ID_KEY]}-instance'
    rds_subscription_name = f'{test_context[ENV_ID_KEY]}-subscription'

    sns_topic = create_sns_topic(test_context[ENV_ID_KEY])

    # [START howto_operator_rds_create_event_subscription]
    create_subscription = RdsCreateEventSubscriptionOperator(
        task_id='create_subscription',
        subscription_name=rds_subscription_name,
        sns_topic_arn=sns_topic,
        source_type='db-instance',
        source_ids=[rds_instance_name],
        event_categories=['availability'],
    )
    # [END howto_operator_rds_create_event_subscription]

    # [START howto_operator_rds_delete_event_subscription]
    delete_subscription = RdsDeleteEventSubscriptionOperator(
        task_id='delete_subscription',
        subscription_name=rds_subscription_name,
    )
    # [END howto_operator_rds_delete_event_subscription]

    chain(
        # TEST SETUP
        test_context,
        sns_topic,
        create_rds_instance(rds_db_name, rds_instance_name),
        # TEST BODY
        create_subscription,
        delete_subscription,
        # TEST TEARDOWN
        delete_db_instance(rds_instance_name),
        delete_sns_topic(sns_topic),
    )

    from tests.system.utils.watcher import watcher

    # This test needs watcher in order to properly mark success/failure
    # when "tearDown" task with trigger rule is part of the DAG
    list(dag.tasks) >> watcher()


from tests.system.utils import get_test_run  # noqa: E402

# Needed to run the example DAG with pytest (see: tests/system/README.md#run_via_pytest)
[docs]test_run = get_test_run(dag)